• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	C2a(i)	C2a(i); D1

Red List history

Year	Category	Criteria
2016	Endangered	C2a(i)
2012	Endangered	C2a(i)
2008	Endangered	C2a(i)
2004	Endangered
2000	Endangered
1996	Endangered
1994	Endangered
1988	Threatened

Migratory status	not a migrant	Forest dependency	high
Land-mass type	Land-mass type - shelf island	Average mass	-

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	126,000	medium
Number of locations	11-100	-
Severely fragmented?	no	-

	Value	Data quality	Derivation	Year of estimate
Number of mature individuals	300-500	medium	estimated	2001
Population trend	decreasing	poor	suspected	1988-2044
Decline % (10 years/3 generations future)	10-19	-	-	-
Decline % (10 years/3 generations past and future)	10-19	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage in largest subpopulation	1-89	-	-	-
Generation length (years)	18.5	-	-	-

Population justification: The population is estimated to number 600-900 individuals, roughly equating to 300-500 mature individuals, based on a 1:1 ratio of adults to juvenile and immature birds, as recorded in past studies (B. van Balen in litt. 2012).

Trend justification: This species is suspected to be in decline at a moderate rate, owing to on-going habitat loss and degradation in the face of human population growth, combined with capture for trade. Recent nest protection may have improved reproductive success, but the benefits accrued may have been countered by an apparent increase in trade of this species following its elevation to national bird.

Country/Territory	Presence	Origin	Resident	Breeding	Non-breeding	Passage
Indonesia	extant	native		yes

Country/Territory	IBA Name
Indonesia	Gunung Sawal
Indonesia	Gunung Papandayan-Kamojang
Indonesia	Gunung Burangrang - Tangkuban Perahu
Indonesia	Gunung Tilu-Simpang
Indonesia	Gunung Masigit-Kareumbi
Indonesia	Gunung Tampomas
Indonesia	Gunung Malabar
Indonesia	Gunung Halimun
Indonesia	Gunung Salak
Indonesia	Gunung Gede - Pangrango
Indonesia	Telaga Warna-Cibulao
Indonesia	Gunung Pancar
Indonesia	Gunung Aseupan
Indonesia	Gunung Karang
Indonesia	Rawa Danau
Indonesia	Ujung Kulon
Indonesia	Gunung Segara
Indonesia	Gunung Slamet
Indonesia	Pegunungan Dieng
Indonesia	Gunung Ungaran
Indonesia	Gunung Merapi
Indonesia	Gunung Muria
Indonesia	Gunung Liman-Wilis
Indonesia	Gunung Kawi-Kelud
Indonesia	Tahura R. Soerjo
Indonesia	Gunung Bromo Tengger-Semeru
Indonesia	Teluk Lenggasana - Pulau Sempu
Indonesia	Dataran Tinggi Hyang
Indonesia	Meru Betiri
Indonesia	Gunung Raung
Indonesia	Gunung Ijen
Indonesia	Baluran
Indonesia	Alas Purwo

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	0 - 2000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Pets/display animals, horticulture	-	-			non-trivial	recent

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Recommended citation
BirdLife International (2023) Species factsheet: Nisaetus bartelsi. Downloaded from http://datazone.birdlife.org/species/factsheet/javan-hawk-eagle-nisaetus-bartelsi on 04/10/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 04/10/2023.